When I run my final review before filing TurboTax Deluxe changes my refund by $50

When I run my 2021 federal taxes and run the review my refund is $949.  I run the review and there are zero errors found.  Once I complete my state all is still ok.  When I run my final review prior to the filing step my federal refund drops by $50 to $899.  I still am told there are zero errors.  I did not change anything during the process.  

 

Is there a bug?  When I click the back button the amount goes back up.